On the Spectral Efficiency of Selective Decode-and-Forward Relaying

Multirelay cooperative relaying enables spatial diversity, often at the expense of spectral efficiency. To alleviate the loss in spectral efficiency due to half-duplex relaying and transmission over orthogonal channels, the authors propose a novel transmission scheme for selective decode-and-forward (DF) networks. In this scheme, the authors assume that destination may receive signals from transmitting nodes with different modulation levels. Particularly, the authors obtain a closed-form expression for both end-to-end (E2E) average error probability and spectral efficiency in such a scheme. Subsequently, using these closed-form expressions and average channel statistics, the authors perform joint optimization of power allocation and modulation level selection to maximize the E2E spectral efficiency while maintaining a target E2E average error probability and a set of transmit power constraints. Simulation results demonstrate that the transmission scheme proposed herein improves the E2E spectral efficiency significantly, in comparison with the conventional adaptive DF transmission scheme.


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  • Accession Number: 01638448
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 23 2017 11:40AM